I have 36 columns represents as many months, the values in these columns show the number of IT resource units used by a bunch of applications in my workplace (each app is a row). I want to calculate the percentage growth for each application.
I realise I can simply use an equation:
(m36 – m1) / m1 * 100
However, if m1 or m36 represent an atypical value, this will skew the result. Rather I want a more consistent average. Is there a formula in excel to do this or does anyone know a better equation?
Convert to the log-domain (so that you should get a straight line, outliers notwithstanding), and then apply linear regression.